The correct is D
Check below:
Generally, a signal with an SNR value of 20 dB or more is recommended for data networks where as an SNR value of 25 dB or more is recommended for networks that use voice applications.
A. signal strength -66 dBm, noise 90 dBm=24dB
B. signal strength -67 dBm, noise 91 dBm=24dB
C. signal strength -68 dBm, noise 89 dBm=21dB
D. signal strength -69 dBm, noise 94 dBm=25dB <- Correct
None of the answers are correct, they should be as follows:
A. signal strength -66 dBm, noise -90 dBm
B. signal strength -67 dBm, noise -91 dBm
C. signal strength -68 dBm, noise -89 dBm
D. signal strength -69 dBm, noise -94 dBm
Even if fixed, the answer is D and not B, as -69 -(-94) = 25 which is the recommended SNR for voice applications.
The noise must be negative so that the difference is positive (a negative SNR indicates that the noise dominates the signal, which is unacceptable.)
-69 - (-94) = 25 dB
None of these choices are correct -
"The minimum recommended wireless signal strength for voice applications is -67 dBm and the minimum SNR is 25 dB."
https://www.cisco.com/c/en/us/support/docs/wireless/5500-series-wireless-controllers/116057-site-survey-guidelines-wlan-00.html
B
https://www.cisco.com/c/en/us/support/docs/wireless/5500-series-wireless-controllers/116057-site-survey-guidelines-wlan-00.html
"The minimum recommended wireless signal strength for voice applications is -67 dBm and the minimum SNR is 25 dB."
I just re-read the question. They're only interested in the SNR meeting minimum requirement, so answer is definitely D as it is the only answer that meets the minimum SNR, even if it doesn't meet industry signal strength requirement
B fits the signal strength requirement, but not the SNR requirement.
SNR for B is 24 (-91-(-67)) = 24
So really none of the answers fit.
A & B fit the minimum strength requirement
But only D fits the SNR minimum requirement but not the strength requirement.
Generally, a signal with an SNR value of 20 dB or more is recommended for data networks where as an SNR value of 25 dB or more is recommended for networks that use voice applications
https://documentation.meraki.com/MR/Wi-Fi_Basics_and_Best_Practices/Signal-to-Noise_Ratio_(SNR)_and_Wireless_Signal_Strength#:~:text=Generally%2C%20a%20signal%20with%20an,networks%20that%20use%20voice%20applications.
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